Alert archive / Alabama / Flash Flood Warnings in 2011

Flash Flood Warning 9, NWS Birmingham, AL

April 4, 2011Lamar County, Alabama

NWS Birmingham, AL issued this flash flood warning at Apr 4, 2011, 4:37 PM CDT for Lamar County, Alabama. It was in force for 3 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 4, 2011, 4:37 PM CDT (21:37 UTC)
Expired: Apr 4, 2011, 7:30 PM CDT
In force: 3 hr
Issued by: NWS Birmingham, AL
Area: Storm-based polygon
Flood severity: None

County Lamar County, AL

The radar

The Columbus AFB radar (KGWX), 18 km from the middle of the area, began a volume at 21:37 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Apr 4, 6:16 PM CDT	HEAVY RAIN 3	Millport, AL	APPROX 2 HOURS AFTER RADAR ESTIMATE OF START TIME.
Apr 4, 7:28 PM CDT	FLASH FLOOD	Kennedy, AL	A FEW ROADS HAVE BEEN CLOSED IN SOUTHERN LAMAR. THE ROADS WERE IMPASSABLE DUE TO HIGH WATER.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.6 hours before the alert went out and 147 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 45 J/kg
Mixed-layer CIN: -348 J/kg
Mixed-layer LCL: 509 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 332 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

269 
WGUS54 KBMX 042137
FFWBMX
ALC075-050030-
/O.NEW.KBMX.FF.W.0009.110404T2137Z-110405T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
437 PM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  LAMAR COUNTY IN WEST CENTRAL ALABAMA...

* UNTIL 730 PM CDT

* AT 435 PM CDT...NATIONAL WEATHER SERVICE INDICATED SLOW MOVING     
  THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. TWO 
  TO THREE INCHES OF RAINFALL WILL BE POSSIBLE.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...     
  MILLPORT...SULLIGENT...VERNON...BEAVERTON...KENNEDY AND LAMAR      
  COUNTY AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

TO REPORT SEVERE WEATHER...
CALL 1-800-856-0758.

LAT...LON 3401 8821 3405 8821 3405 8805 3402 8796
      3353 8795 3354 8828 3357 8828

$$

1 follow-up statement

685 
WGUS74 KBMX 042246
FFSBMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
546 PM CDT MON APR 4 2011

ALC075-050030-
/O.CON.KBMX.FF.W.0009.000000T0000Z-110405T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LAMAR AL-
546 PM CDT MON APR 4 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR LAMAR
COUNTY...

AT 536 PM CDT...A LINE OF STRONG TO SEVERE THUNDERSTORMS WAS 
PRODUCING VERY HEAVY RAIN OVER THE WARNED AREA. THE HEAVIEST 
RAINFALL AMOUNTS WILL BE OVER SOUTHERN LAMAR COUNTY AND SOME AREAS 
FROM NEAR VERNON TO MILLPORT MAY EXPERIENCE SEVERE FLASH FLOODING 
WITH CREEKS AND STREAMS COVERING ROADWAYS.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LAMAR COUNTY
AIRPORT...CREWS...SULLIGENT...DETROIT AND BEAVERTON

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF ONE TO TWO INCHES ARE POSSIBLE IN THE 
WARNED AREA IN ADDITION TO THE TWO TO THREE INCHES OF RAIN THAT HAS 
ALREADY FALLEN. 

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS... AND HIGHWAYS. ADDITIONALLY...COUNTRY ROADS AND 
FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING 
AREAS ARE SUBJECT TO FLOODING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING 
FOR LAMAR COUNTY. 

&&

TO REPORT SEVERE WEATHER...
CALL 1-800-856-0758.

LAT...LON 3401 8821 3405 8821 3405 8805 3402 8796
      3353 8795 3354 8828 3357 8828

$$

The office that day

Everything else NWS Birmingham, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 4, 4:21 AM CDT	Wind Advisory	BMX	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	24 hr
Apr 4, 1:57 PM CDT	Special Weather Statement	BMX	Marion	48 min
Apr 4, 2:48 PM CDT	Special Weather Statement	BMX	Marion	42 min
Apr 4, 3:05 PM CDT	Areal Flood Advisory	BMX	Marion	115 min
Apr 4, 3:27 PM CDT	Special Weather Statement	BMX	Marion	48 min
Apr 4, 3:54 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Lamar, Marion, Pickens	51 min
Apr 4, 3:55 PM CDT	Areal Flood Advisory	BMX	Lamar	3 hr
Apr 4, 4:27 PM CDT	Special Weather Statement	BMX	Marion	48 min
Apr 4, 4:35 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Marion, Walker, Winston	40 min
Apr 4, 4:43 PM CDT	Severe Thunderstorm Warning	BMX	Lamar, Pickens	47 min
Apr 4, 4:52 PM CDT	Severe Thunderstorm Warning	BMX	Marion, Winston	23 min
Apr 4, 4:53 PM CDT	Areal Flood Advisory	BMX	Winston	112 min
Apr 4, 5:19 PM CDT	Areal Flood Advisory	BMX	Fayette	116 min
Apr 4, 5:25 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Lamar, Pickens	50 min
Apr 4, 5:27 PM CDT	Special Weather Statement	BMX	Winston	48 min
Apr 4, 5:30 PM CDT	Severe Thunderstorm Warning	BMX	Walker, Winston	45 min
Apr 4, 5:52 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Walker	53 min
Apr 4, 5:56 PM CDT	Areal Flood Advisory	BMX	Pickens	3 hr
Apr 4, 6:04 PM CDT	Areal Flood Advisory	BMX	Walker	3 hr
Apr 4, 6:07 PM CDT	Severe Thunderstorm Warning	BMX	Fayette, Pickens, Tuscaloosa, Walker	38 min
Apr 4, 6:16 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Walker, Winston	44 min
Apr 4, 6:18 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens, Sumter, Tuscaloosa	57 min
Apr 4, 6:20 PM CDT	Severe Thunderstorm Warning	BMX	Walker, Winston	40 min
Apr 4, 6:21 PM CDT	Areal Flood Advisory	BMX	Tuscaloosa	3 hr
Apr 4, 6:34 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Jefferson, Walker	41 min
Apr 4, 6:40 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens, Sumter, Tuscaloosa	50 min

Nearby

Flash Flood Warnings in Alabama, 2011 Every flash flood warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.